TWI407136B - Antiglare film - Google Patents

Abstract

An antiglare film is provided. The antiglare film includes a resin, a plurality of first antiglare particles and a plurality of second antiglare particles. The first antiglare particles are spread in the bottom of the resin, wherein the difference in refractive index between the first antiglare particle and the resin is less than 0.01. The second antiglare particles are spread on the top of the resin, wherein the oil absorption of the first antiglare particle is less than the oil absorption of the second antiglare particle.

Description

Anti-glare coating

This invention relates to an anti-glare coating layer.

The anti-glare effect is one of the important factors that affect the display effect of optical components or displays. The preferred anti-glare effect reduces glare and improves display. Therefore, anti-glare films are often used in optical components or displays to enhance the anti-glare effect.

As shown in FIG. 1A, one of the conventional anti-glare film processes is to use a substrate 31 made of a transparent resin and a plurality of water-soluble particles 33, and the water-soluble particles 33 are melted to form a cavity 32. The anti-glare film 3 can have a low light absorption rate. As shown in FIG. 1B, another conventional anti-glare film process uniformly disperses two different particles 12, 14 in the transparent resin 10. Among them, some of the particles are exposed on the surface of the optical film 1 to cause surface irregularities, which cause light to scatter and refract on the surface, thereby achieving an anti-glare effect. If particles with a large particle size are used to produce an anti-glare effect on the surface, it is easy to cause orange peel phenomenon. Particles with small particle size should be used to highlight the resin layer, but the large amount of particles will affect the penetration rate. Therefore, the solution of the present invention can achieve the anti-glare effect while reducing the orange peel phenomenon, thereby obtaining a high resolution effect.

It is an object of the present invention to provide an anti-glare coating layer which can form an anti-glare optical film, which increases sharpness and reduces gloss, and has a better anti-glare effect.

The anti-glare coating layer of the present invention comprises a resin, a plurality of first optical particles, and a plurality of second optical particles. The first optical particles are distributed on the resin underlayer, and the difference between the refractive index of the first optical particles and the refractive index of the resin is less than 0.01. The second optical particles are distributed on the surface layer of the resin, and the oil absorption amount of the first optical particles is smaller than the oil absorption amount of the second optical particles.

In a preferred embodiment, the first optical particles have an oil absorption of from 40 g/(100 g oil) to 80 g/(100 g oil) and a stack density of from 0.7 g/ml to 1.3 g/ml. 3 μm to 5 μm, the particle diameter is larger than the particle diameter of the second optical particles. The first optical particles are distributed in a single layer on the resin underlayer. The second optical particles have an oil absorption of from 200 g/(100 g oil) to 300 g/(100 g oil), a stack density of from 0.4 g/ml to 0.7 g/ml, and a particle diameter of from 1 μm to 3 μm. Wherein, the first optical particles are truly spherical, and the second optical particles are irregular.

As shown in the preferred embodiment of FIG. 2, the anti-glare coating layer 800 of the present invention comprises a resin 300, a plurality of first optical particles 100, and a plurality of second optical particles 200. The first optical particles 100 are distributed on the bottom layer of the resin 300, and the second optical particles 200 are distributed on the surface layer of the resin 300. The first optical microparticles 100 and the second optical microparticles 200 are preferably distributed on the surface layer and the bottom layer of the resin 300, respectively, by the difference in oil absorption. Specifically, the higher the oil absorption amount of the particles, the larger the surface area thereof, so that the appearance of the particles is more uneven and rough and uneven, so that it is easier to float to the surface in the coating liquid. In the preferred embodiment, the first optical particles 100 are spherical in shape and have a flat surface, so that they are more likely to sink to the bottom in the resin 300. The second optical particles 200 are irregular in shape and are therefore more likely to float to the surface. However, in various embodiments, the first optical particles 100 are not limited to true spherical shapes. Further, the irregular surface shape of the second optical particles 200 of the present invention can improve the orange peel phenomenon, the size of which is on the micrometer scale, and can also provide sufficient external haze to have an anti-glare effect.

In the preferred embodiment shown in FIG. 2, the first optical particles 100 are distributed in a single layer on the bottom layer of the resin 300, that is, the first optical particles 100 are not stacked with each other, but are laid on the bottom of the resin 300. . Specifically, the stack density has an inverse relationship with the oil absorption. When the oil absorption of the particles is larger, the stacking density is lower. Therefore, in the present invention, the first optical particles 100 having a higher stack density sink to the bottom of the coating liquid. Therefore, both the oil absorption and the stack density affect the reason why the two optical particles have this special structure in the anti-glare film. On the other hand, the second optical particles 200 are preferably distributed in a floating manner on the surface layer of the resin 300, and the second optical particles 200 are stacked with each other. However, in various embodiments, the first optical particles 100 may have a stacked condition with each other, and the second optical particles 200 may occur without a stacking condition with each other. Further, when the first optical microparticles 100 have a stacked condition, they are stacked upward from the bottom surface of the resin 300 and do not protrude from the upper surface of the resin 300.

The difference between the refractive index of the first optical particles 100 and the refractive index of the resin 300 is less than 0.01. Specifically, the refractive index of the first optical microparticles 100 is approximately equal to the refractive index of the resin 300. For example, in the preferred embodiment, the first optical particle 100 has a refractive index of 1.525 and the resin 300 has a refractive index of 1.52. Thereby, internal haze generation can be avoided, and the sharpness and transparency of the anti-glare coating layer 800 can be further maintained. The oil absorption amount of the first optical particles 100 is smaller than the oil absorption amount of the second optical particles 200. Among them, the oil absorption is measured by the ASTM D281.1251-2 Oil Absorption of Pigments standard measurement method. The oil absorption amount of the first optical particles 100 is preferably from 40 g/(100 g oil) to 80 g/(100 g oil), more preferably from 55 g/(100 g oil) to 60 g/(100 g oil). The oil absorption of the second optical particles is preferably from 200 g/(100 g oil) to 300 g/(100 g oil), more preferably from 250 g/(100 g oil) to 260 g/(100 g oil).

The stack density of the first optical particles 100 is preferably from 0.7 g/ml to 1.3 g/ml, more preferably from 0.8 g/ml to 0.9 g/ml. The stack density of the second optical particles 200 is preferably from 0.4 g/ml to 0.7 g/ml, more preferably from 0.5 g/ml to 0.6 g/ml. The particle diameter of the first optical particles 100 is preferably from 3 μm to 5 μm, and the particle diameter of the second optical particles 200 is preferably from 1 μm to 3 μm, more preferably 2 μm. Specifically, the particle diameter of the first optical microparticles 100 is larger than the particle diameter of the second optical microparticles 200, and the second optical microparticles can make the surface of the antiglare coating layer 800 finer and reduce the orange peel phenomenon. Specifically, when the optical particles are truly spherical, the aforementioned particle diameter means a single dispersed particle diameter, that is, at least 80% of the particle diameter is within an acceptable error range (for example, ± 1 μm).

The resin 300 is preferably transparent and has properties curable by ultraviolet light irradiation such as polyester resin, polyether resin, acrylic resin, epoxy resin, urethane resin, alkyd resin, spiro acetal resin, poly A thiol polyene resin, a polybutadiene resin or a mixture thereof. As shown in FIG. 1, the anti-glare coating layer 800 preferably forms an anti-glare optical film 900 together with the substrate 400. Specifically, the first optical microparticles 100, the second optical microparticles 200, and the resin 300 are added to a solvent to form an anti-glare coating layer 800 in a solution state, and then applied to the substrate by spin coating, spray coating, or knife coating. On the material 400, the resin 300 in the anti-glare coating layer 800 is cured by ultraviolet light irradiation or the like, and the anti-glare coating layer 800 is formed on the substrate 400. The solvent may be isopropanol, aceton, ethyl acetate, heptane, toluene, hexane, methyl ethyl ketone. , propylene glycol monomethyl ether or a mixture thereof. The substrate 400 is a highly transparent organic material, and includes triethyl fluorenyl cellulose, polyethylene terephthalate, acetylene cellulose, acetic acid butyric acid resin, polyether oxime, polyacrylic resin, and amine group. A formic acid resin, a polyester, a polycarbonate polypeptone, a polyether, a polymethylammonium phthalate, a polyether ketone or a methacrylic acid, and preferably has a thickness of from 25 μm to 300 μm.

The effect of the anti-glare optical film made of the anti-glare coating layer of the present invention will be described below by way of various examples.

[Example 1]

In the first embodiment, 10 g of ultraviolet light curing resin (PC8-9231, manufactured by DIC Corporation), 0.6 g of first optical particles (XX-1448Z, Sekisui Corporation), and 0.5 g of second optical particles (SPB-) were used. 100, Fujisilisia Co., Ltd., diluted into a coating liquid with 6.25 g of an isopropanol solvent. Then, the coating liquid was coated on a 80 μm thick triacetylcellulose (TAC) transparent substrate (Fuji Co., Ltd.) with a coating bar, and dried in a circulating oven at 80 ° C for about 1 minute, and the energy intensity was about 540 mJ / The ultraviolet light of cm ² was irradiated, and thus the anti-glare optical film of Example 1 was completed.

[Comparative Example 1]

In Comparative Example 1, 10 g of an ultraviolet curable resin (PC8-9231, manufactured by DIC Corporation) and 0.3 g of optical fine particles (XX-1448Z, Sekisui Co., Ltd.) were diluted with a solvent of 6.25 g of an isopropanol solvent to form a coating liquid. Then, the coating liquid was coated on a 80 μm thick triacetylcellulose (TAC) transparent substrate (Fuji Co., Ltd.) with a coating bar, and dried in a circulating oven at 80 ° C for about 1 minute, and the energy intensity was about 540 mJ / The ultraviolet light of cm ² was irradiated, and thus the anti-glare optical film of Comparative Example 1 was completed.

[Comparative Example 2]

In Comparative Example 2, 10 g of an ultraviolet curable resin (PC8-9231, manufactured by DIC Corporation) and 0.5 g of optical fine particles (SPB-100, Fujisilisia Co., Ltd.) were diluted with a solvent of 6.25 g of an isopropanol solvent to form a coating liquid. Then, the coating liquid was coated on a 80 μm thick triacetylcellulose (TAC) transparent substrate (Fuji Co., Ltd.) with a coating bar, and dried in a circulating oven at 80 ° C for about 1 minute, and the energy intensity was about 540 mJ / The ultraviolet light of cm ² was irradiated, and thus the anti-glare optical film of Comparative Example 2 was completed.

Specifically, the anti-glare optical film of the first embodiment comprises the anti-glare coating layer of the present invention, that is, has a resin, a plurality of first optical particles, and a plurality of second optical particles. In Comparative Example 1 and Comparative Example 2, only the first optical microparticles and the second optical microparticles were separately added. The effects of the antiglare optical film produced in Example 1, Comparative Example 1 and Comparative Example 2 are shown in Table 1 below.

From the results of Table 1, it is known that the anti-glare optical film of Comparative Example 1 has a high transmittance and sharpness, and the surface has a distinct orange peel phenomenon. The orange peel phenomenon on the surface of the anti-glare optical film of Comparative Example 2 is not obvious, but the definition is low. In contrast, the anti-glare optical film produced by using the anti-glare coating layer of the present invention has excellent haze, transmittance, sharpness and resolution. That is, the surface remains fine while having high transmittance and sharpness.

While the foregoing description of the preferred embodiments of the invention, the embodiments of the invention The spirit and scope of the principles of the invention. Modifications of many forms, structures, arrangements, ratios, materials, components and components can be made by those skilled in the art to which the invention pertains. Therefore, the embodiments disclosed herein are to be considered as illustrative and not restrictive. The scope of the present invention is defined by the scope of the appended claims, and the legal equivalents thereof are not limited to the foregoing description.

1. . . Optical film

2. . . Substrate

3. . . Anti-glare film

4. . . Transparent substrate

10. . . Transparent resin

12. . . particle

14. . . particle

31. . . Matrix

33. . . Water soluble particles

32. . . Pocket

100. . . First optical particle

200. . . Second optical particle

300. . . Resin

400. . . Substrate

800. . . Anti-glare coating

900. . . Anti-glare optical film

1A and 1B are schematic views of a prior art;

2 is a schematic view of a preferred embodiment of the present invention.

100. . . First optical particle

200. . . Second optical particle

300. . . Resin

400. . . Substrate

800. . . Anti-glare coating

900. . . Anti-glare optical film

Claims (13)

An anti-glare coating layer comprising: a resin; a plurality of first optical particles distributed on the resin underlayer, wherein a difference between a refractive index of the first optical particles and a refractive index of the resin is less than 0.01; and a plurality of second The optical particles are distributed on the surface layer of the resin, and the oil absorption amount of the first optical particles is smaller than the oil absorption amount of the second optical particles. The anti-glare coating layer of claim 1, wherein the first optical particles have an oil absorption of from 40 g/(100 g oil) to 80 g/(100 g oil). The anti-glare coating layer of claim 1, wherein the first optical particles have an oil absorption of from 55 g/(100 g oil) to 60 g/(100 g oil). The anti-glare coating layer of claim 1, wherein the first optical microparticles have a stack density of from 0.7 g/ml to 1.3 g/ml. The anti-glare coating layer of claim 1, wherein the first optical microparticles have a stack density of from 0.8 g/ml to 0.9 g/ml. The anti-glare coating layer according to claim 1, wherein the first optical microparticles and the second optical microparticles have a particle diameter of from 1 μm to 10 μm. The anti-glare coating layer of claim 1, wherein the first optical particles have a larger particle diameter than the second optical particles. The anti-glare coating layer of claim 1, wherein the first optical microparticles are distributed in a single layer to the resin underlayer. The anti-glare coating layer according to claim 1, wherein the second optical particles have an oil absorption amount of from 200 g/(100 g oil) to 300 g/(100 g oil). The anti-glare coating layer of claim 1, wherein the second optical particles have an oil absorption of from 250 g/(100 g oil) to 260 g/(100 g oil). The anti-glare coating layer of claim 1, wherein the second optical microparticles have a stack density of from 0.4 g/ml to 0.7 g/ml. The anti-glare coating layer of claim 1, wherein the second optical microparticles have a stack density of from 0.5 g/ml to 0.6 g/ml. The anti-glare coating layer of claim 1, wherein the first optical particles are truly spherical, and the second optical particles are irregular.